I wonder how hard it would be to have an actual fuel gauge. I ran out of fuel on the last lap at monaco, 3 laps to go it said I had +1 lap in standard fuel setting. My tires were going though and I was spinning a lot, but trying to take another position so not letting off. I went from +1 lap on lap 37, to optimal on 38, to -1 on 39 and half way through lap 39 my engine cut out.
Indeed I had my car geared lower, but starting around lap 6 I was trying to stay out of the limiter, early shifting every where to save gas and tires.
A better indicator would be better I think